SU1733490A1 - Method of processing zinc-containing materials - Google Patents

Abstract

The invention relates to non-ferrous metallurgy, in particular, to methods for the processing of zinc-containing raw materials by virtue of valice. The purpose of the invention is to increase the productivity of the process, reducing the zinc content in the clinker and the cost of the fuel regenerator. To do this, in the processing of zinc cakes by valving, including their charge with coking and the second carbon component, the heat insulating charge of graphitization of the following composition is used as the last,%: mineralized heat insulation 33-67%; carbon thermal insulation 33-67. The heat insulating charge of graphitization is introduced in the amount of 11.5-17.5% by weight of the Belsian charge. 1 hp f-ly, 2 tab.

Description

The invention relates to non-ferrous metallurgy, in particular, to methods for processing zinc-containing materials, mainly zinc-containing cakes, by valsevane on a blast enriched with technical oxygen.

The purpose of the invention is to increase the productivity of the process, reducing the zinc content in the clinker and the cost of the fuel-reducing agent.

The goal is achieved by the fact that according to the method of processing zinc-containing materials, including their blend with coking and the second carbonaceous reducing agent obtained from the mineralized heat insulation of graphitization furnaces, and the regenerative calcination of the resulting mixture on the blast enriched with technical oxygen, as the second carbonaceous reducing agent, heat insulating is used The charge of graphitization of the following composition, wt.%:

Mineralized

heat insulation 30-67

Carbon

thermal insulation 33-67

In addition, the heat insulating charge of graphitization is introduced in the amount of 11.5-17.5% of the mass of the Vel'tsevan charge.

An increase in the productivity of the process is achieved by increasing the proportion of thermal insulation (having a high thermal conductivity) in the maintenance charge (from 1.5-10 to 11.5-17.5%), which reduces its thermal inertia and provides for the expansion of the recovery oven.

The reduction of zinc content in clinker is achieved due to the ability of carbides of ash-forming impurities of mineralized heat insulation at 1300-1400 ° C (in conditions of oxygen use)

SP

with

x |

Oj

WITH

J o o

to restore zinc from its oxidized and hard-to-restore compounds directly in the coronable charge.

The method is carried out as follows.

Mineralized heat insulation is mixed with carbon, withstanding, depending on the ash content, its content in the heat insulation mixture is within 33–67%. The specified content is set based on the condition of obtaining commercial copper clinker with minimal loss of zinc with it.

The resulting heat insulating charge of graphitization, together with coking, is fed into the charging furnace of the pelican, where the zinc-containing material, mainly zinc cakes, is loaded. The amount of heat-insulating charge introduced for valching is kept within 11.5-17.5% of the mass of Veltsevan batch. Restorative firing of the charge of Vel'tsevani lead to a blast enriched with technical oxygen.

With exorbitant amounts of heat insulating charge in the Velcev blend, the process performance parameters of the pellet furnace decrease, and the quality of the clinker produced is lower compared to the known method due to its lower copper content or higher zinc content.

In addition, the upper limit of the amount of heat insulating batch in a balsa charge is determined by the quality of velco-acid produced. The decrease in the quality of the Velcino-Kislov is due to the increased dust content of the thermal insulation, which causes a decrease in the oxygen content in the gas space of the Waelz furnace.

Example. The method was tested on two Weltzers with a diameter of 2.5 m and a length of 41 m. The zinc cake composition was subjected to the Welshanning,%: zinc 17.7-20.5; lead 5.3-6.7; iron 17.5-20.8; copper 2.4-2.6; cadmium 0.23-0.25; sulfur 5.8-6.7.

As components of the carbonaceous reductant, KM-2 coke breeze was used and electrode production graphitization wastes with the characteristics given in Table 1.

A heat-insulated charge of graphitization was prepared by volumetric dosing and mixing of mineralized and carbon thermal insulation. The resulting heat insulating charge was blended with coke breeze also by volumetric dosing and mixing in the required ratio.

The resulting mixture of carbonaceous reducing agents of each composition was filed in

consumable bunkers and then through weight measuring devices into boot furnaces in heat for the current zinc cakes.

During the tests, the oxygen consumption was kept constant (190–195 m3 / h per furnace) for enrichment of air blowing and the temperature of exhaust gases within the prescribed limits (570-600 ° C) by changing the furnace charge of zinc cakes and carbonaceous mixtures , as well as fuel oil consumption for additional heating.

Indicators of pilot tests are given in table 2. From the data presented in Table 2, it can be seen that the optimal component composition of the heat insulating graphitization charge is as follows, in wt.%:

Mineralized thermal insulation 33-67

Carbon

thermal insulation 33-67

The optimum amount of heat insulating charge introduced on the waelting to replace the coke is 11.5-17.5% of the mass of the wels blender.

With extreme levels of heat insulating charge in the velcev mixture, the technological parameters of the veltsevanization of zinc cakes are lower compared with the known processing method.

The proposed method, in comparison with the known method, provides an increase in the productivity of blast furnaces for the processing of zinc-containing materials by 5.7–8.0%, a decrease in the zinc content in the clinker from 0.82 to 0.76–0.68%, and also a decrease in the cost of fuel reducing agent,

Claims (2)

1. A method of processing zinc-containing materials, mainly zinc-containing cakes, by virtue of cladding, including their charge with coking and a second carbonaceous reducing agent, obtained from the mineralized heat insulation of graphitization furnaces, and restoration roasting of the resulting charge on a blast enriched with technical oxygen, different the fact that, with the aim of increasing the productivity of the process, reducing the zinc content in the clinker and the cost of the reducing fuel, as a second carbonaceous reducing agent, those loizol tional batch graphitization of the following composition, wt.%: 33-67 mineralized thermal insulation Carbon thermal insulation 33-67 2. The method according to claim 1, characterized in that the heat insulating charge of graphitization is introduced in the amount of 11.5-17.5% of the mass of the Veltsev charge. table 2 Indicators of veltsevaniya zinc cakes on a mixture of coke and spent heat insulation with a particle size of 2-10 mm and a mixture of coke and heat insulating charge of graphitization of variable composition on an oxygen-rich blast Table 1 st 8.8 8.2 Lai 7.5 6.7 6.2 M 577 579 582 590 593 598 8 g-g e, 5 90.5 86.1 85.7 85.6 Bk, Q Continued tabl, 2 3.1 2.8 3.1 3.1 3.1 3.1 8.2 7.3 8.0 8.1 8.3 8.5 71.6 72.4 71.9 71.5 70.8 68.1 1.1 0.98 1.07 1.1 1.15 1, 24